Antenna



Aug. 23, 1955 e. BARTUSKA, JR. ET AL 2,716,191

ANTENNA Filed Jan. 16, 1953 George Barfus/ro, Jr.

John Fric/r JNVENTORS nite 3 35 vliiai'rentc) F ANTENNA George Bartuska,In, and John J. Frick,'South Bend, Ind.,

assignors of one-third to Walter E. Knoop, South Bend, Ind.

Application January 16, 1953, Serial No. 331,706

Claims. c1. 250-33.65)

This invention relates to antennae and more particularly to a dipoleantenna especially adapted for use with ultra high frequency systemssuch as television, radar, and the like.

The particular object of this invention resides in the provision of anunexpectedly sensitive antenna which eliminates certain engineeringproblems arising in the installation, tuning, and the support ofconventional large arrays of dipole antennae.

The construction of this invention features a highly sensitivedirectional dipole antenna including a circular dipole and a reflectorconstituted from a paraboloid of revolution with the dipole as the focusof the paraboloid of revolution. The axis of the paraboloid ofrevolution coincides with the axis of the dipole and the dipole held inspaced relationship from the reflector by suitable insulators. Thedipole is formed with free ends which are clampingly held to thereflector by an insulative bracket.

Still further objects of the invention reside in the provision of adipole antenna that is strong and durable, simple in construction andmanufacture, capable of being installed in lieu of conventional dipoleantenna, and which may be constructed from conventional materials at arelatively low cost.

These, together with the various ancillary objects and features of theinvention which will become apparent as the following descriptionproceeds, are attained by this dipole antenna, a preferred embodiment ofwhich has been illustrated in the accompanying drawings, by way ofexample only, wherein:

Figure 1 is a perspective view of the dipole antenna comprising thepresent invention;

Figure 2 is a front elevational view of this device;

Figure 3 is an enlarged vertical sectional View as taken along the planeof line 33 in Figure 2;

Figure 4 is a sectional detail view as taken along the plane of line 44in Figure 1 showing the construction of the supporting means for theends of the dipole; and,

Figure 5 is a perspective detail view showing the con-- struction of theinsulative bracket for supporting the ends of the dipole.

With continuing reference to the accompanying drawings wherein likereference numerals designate similar parts throughout the various views,reference numeral generally designates the dipole antenna comprising thepresent invention which includes a circular dipole 12 which is shown tobe of a circular cross-section. It is Within the concept of theinvention to construct this dipole from any suitable and conventionalmaterial and it may be formed of such cross-sectional shape as toprovide the best operating characteristics. The dipole 12 is circular inshape and has its free ends 14 and 16 held in spaced relationship.

The circular dipole 12 is used in conjunction with a reflector 18 whichis constituted from a paraboloid of revolution with the dipole 12 as thefocus of the paraboloid of revolution. As shown in the drawings the lips20 and 22 of the reflector do not extend about the dipole 12,

, 2,716,191 Pa ted "Aug-,2 ,-,--i1 55 Ice but if it is desired toconstruct the antenna with sucha filfi figuration, it iswithin theconcept of this invention to do so. Y

I Suitable insulators 24 and 26 are usedtosupport the dipole 12 inspaced relationship relative to thereflector 18. It is to be noted thatthenumber of. supporting insulators as at 22 and 24 may bevaried .and itis highly. advantageous to use as few insulators of as small size as ispossible. It is within the concept of this invention to provide aninsulative bracket of any suitable configuration as at 28 for supportingthe free ends 14 and 16 of the dipole in such manner that the coaxialcable connected to each of the free ends 14 and 16 and as indicated at30 may be connected to the free ends for connection to the receiver. Thebracket 28 as can be best seen in Figure 5 may consist of a tubularportion 32 having an aperture 34 therethrough through which theconductors 30 can pass. There is further provided a clip portion 34having lugs adapted to embrace the dipole 12. The clip portion 34 may beconstructed so as to clampingly engage the ends 14 and 16 of the dipole12 and the entire bracket 28 may be constructed from such insulativematerial as Plexiglas, or other suitable materials. Various otherconfigurations and shapes of brackets 28 may be used as desired.

Since from the foregoing, the construction and advantages of thisantenna are readily apparent, further description is believed to beunnecessary. It is to be noted, however, that this unexpectedlysensitive antenna is of extreme compactness of construction and may beeasily incorporated in various designs for military and commercialfunctions.

Numerous modifications will readily occur to those skilled in the artafter a consideration of the foregoing specification and accompanyingdrawings, and it is therefore not the intention to limit the inventionto the precise embodiment shown and described, but all suitablemodifications and equivalents may be readily resorted to.

What is claimed as new is as follows:

1. An antenna comprising a circular dipole and a reflector constitutedfrom a paraboloid of revolution with said dipole as the focus of saidparaboloid of revolution, the axis of said paraboloid of revolutioncoinciding with the axis of said dipole, the reflector having inner andouter circular peripheral edges with the inner peripheral edge being ofa lesser diameter than the diameter of said dipole, and with the outerperipheral edge being of greater diameter than the diameter of thedipole.

2. An antenna comprising a circular dipole and a reflector constitutedfrom a paraboloid of revolution with said dipole as the focus of saidparaboloid of revolution, said dipole having two free ends, thereflector having inner and outer circular peripheral edges with theinner peripheral edge being of a lesser diameter than the diameter ofsaid dipole, and with the outer peripheral edge being of greaterdiameter than the diameter of the dipole, and an insulative supportholding said free ends in spaced relationship to said reflector.

3. An antenna comprising a circular dipole and a reflector constitutedfrom a paraboloid of revolution with said dipole as the focus of saidparaboloid of revolution, the axis of said paraboloid of revolutioncoinciding with the axis of said dipole, the reflector having inner andouter circular peripheral edges with the inner peripheral edge being ofa lesser diameter than the diameter of said dipole and with the outerperipheral edge being of greater diameter than the diameter of thedipole, said dipole having two free ends, and an insulative supportholding said free ends in spaced relationship to said reflector.

4. An antenna comprising a circular dipole and a reflector constitutedfrom a paraboloid of revolution with said dipole as the focus of saidparaboloid of revolution, and means holding said dipole at the focus ofsaid reflector, the reflector having inner and outer circular peripheraledges with the inner peripheral edge being of a lesser diameter than thediameter of said dipole and with the outer peripheral edge being ofgreater diameter than the diameter of the dipole.

5. An antenna comprising a circular dipole and a reflector constitutedfrom a paraboloid of revolution with said dipole as the focus of saidparaboloid of revolution, and means holding said dipole at the focus ofsaid reflector, the axis of said paraboloid of revolution coincidingwith the axis of said dipole, the reflector having inner and ReferencesCited in the file of this patent UNITED STATES PATENTS 1,939,345 Gerthet a1. Dec. 12, 1933 2,153,589 Peterson Apr. 11, 1939 2,608,658 RichardsAug. 26, 1952

